168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-05-30 murmur the first version
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*/
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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*
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*/
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/*
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* 程序清单：tcp 客户端
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*
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* 这是一个 tcp 客户端的例程
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* 导出 tcpclient 命令到控制终端
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* 命令调用格式：tcpclient URL PORT
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* URL：服务器地址 PORT:：端口号
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* 程序功能：接收并显示从服务端发送过来的信息，接收到开头是 'q' 或 'Q' 的信息退出程序
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*/
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#include <rtthread.h>
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#include <sys/socket.h> /* 使用BSD socket，需要包含socket.h头文件 */
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#include <netdb.h>
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#include <string.h>
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#include <finsh.h>
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#define BUFSZ 1024
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static const char send_data[] = {0x88,0xAA,0xBB,0x88,0x00,0x01,0x00,0x00,0x70,0x21,0x00,0x03,0x49,0x41,0x43,0x4B};//"This is TCP Client from RT-Thread."; /* 发送用到的数据 */
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void tcpclient(int argc, char **argv)
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{
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int ret;
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char *recv_data;
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struct hostent *host;
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int sock, bytes_received;
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struct sockaddr_in server_addr;
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const char *url;
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int port;
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if (argc < 3)
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{
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rt_kprintf("Usage: tcpclient URL PORT\n");
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rt_kprintf("Like: tcpclient 10.10.10.72 8005\n");
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return ;
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}
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url = argv[1];
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port = strtoul(argv[2], 0, 10);
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/* 通过函数入口参数url获得host地址（如果是域名，会做域名解析） */
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host = gethostbyname(url);
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/* 分配用于存放接收数据的缓冲 */
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recv_data = rt_malloc(BUFSZ);
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if (recv_data == RT_NULL)
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{
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rt_kprintf("No memory\n");
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return;
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}
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/* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
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if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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{
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/* 创建socket失败 */
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rt_kprintf("Socket error\n");
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/* 释放接收缓冲 */
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rt_free(recv_data);
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return;
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}
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/* 初始化预连接的服务端地址 */
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(port);
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server_addr.sin_addr = *((struct in_addr *)host->h_addr);
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rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
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/* 连接到服务端 */
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if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
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{
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/* 连接失败 */
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rt_kprintf("Connect fail!\n");
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closesocket(sock);
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/*释放接收缓冲 */
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rt_free(recv_data);
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return;
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}
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while (1)
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{
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/* 从sock连接中接收最大BUFSZ - 1字节数据 */
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bytes_received = recv(sock, recv_data, BUFSZ - 1, 0);
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if (bytes_received < 0)
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{
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/* 接收失败，关闭这个连接 */
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closesocket(sock);
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rt_kprintf("\nreceived error,close the socket.\r\n");
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/* 释放接收缓冲 */
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rt_free(recv_data);
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break;
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}
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else if (bytes_received == 0)
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{
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/* 默认 recv 为阻塞模式，此时收到0认为连接出错，关闭这个连接 */
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closesocket(sock);
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rt_kprintf("\nreceived error,close the socket.\r\n");
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/* 释放接收缓冲 */
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rt_free(recv_data);
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break;
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}
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/* 有接收到数据，把末端清零 */
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recv_data[bytes_received] = '\0';
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if (strncmp(recv_data, "q", 1) == 0 || strncmp(recv_data, "Q", 1) == 0)
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{
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/* 如果是首字母是q或Q，关闭这个连接 */
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closesocket(sock);
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rt_kprintf("\n got a 'q' or 'Q',close the socket.\r\n");
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/* 释放接收缓冲 */
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rt_free(recv_data);
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break;
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}
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else
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{
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/* 在控制终端显示收到的数据 */
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rt_kprintf("\nReceived data = %s ", recv_data);
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closesocket(sock);
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// rt_kprintf("\n got a 'q' or 'Q',close the socket.\r\n");
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/* 释放接收缓冲 */
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rt_free(recv_data);
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break;
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}
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/* 发送数据到sock连接 */
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ret = send(sock, send_data, strlen(send_data), 0);
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if (ret < 0)
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{
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/* 发送失败，关闭这个连接 */
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closesocket(sock);
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rt_kprintf("\nsend error,close the socket.\r\n");
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rt_free(recv_data);
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break;
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}
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else if (ret == 0)
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{
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/* 打印send函数返回值为0的警告信息 */
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rt_kprintf("\n Send warning,send function return 0.\r\n");
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}
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}
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return;
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}
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MSH_CMD_EXPORT(tcpclient, a tcp client sample);
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