1 /*
2 * Copyright (c) 2022 HiSilicon (Shanghai) Technologies CO., LIMITED.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <stdio.h>
17 #include "lwip/sockets.h"
18 #include "net_demo.h"
19
20 static char g_request[] = "Hello,I am Lwip";
21 static char g_response[128] = "";
22
TcpClientTest(const char* host, unsigned short port)23 void TcpClientTest(const char* host, unsigned short port)
24 {
25 int sockfd = socket(AF_INET, SOCK_STREAM, 0); // TCP socket
26
27 struct sockaddr_in serverAddr = {0};
28 serverAddr.sin_family = AF_INET; // AF_INET表示IPv4协议
29 serverAddr.sin_port = htons(port); // 端口号，从主机字节序转为网络字节序
30 if (inet_pton(AF_INET, host, &serverAddr.sin_addr) <= 0) { // 将主机IP地址从“点分十进制”字符串 转化为 标准格式（32位整数）
31 printf("inet_pton failed!\r\n");
32 lwip_close(sockfd);
33 }
34
35 // 尝试和目标主机建立连接，连接成功会返回0 ，失败返回 -1
36 if (connect(sockfd, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
37 printf("connect failed!\r\n");
38 lwip_close(sockfd);
39 }
40 printf("connect to server %s success!\r\n", host);
41
42 // 建立连接成功之后，这个TCP socket描述符 —— sockfd 就具有了 “连接状态”，发送、接收 对端都是 connect 参数指定的目标主机和端口
43 ssize_t retval = send(sockfd, g_request, sizeof(g_request), 0);
44 if (retval < 0) {
45 printf("send g_request failed!\r\n");
46 lwip_close(sockfd);
47 }
48 printf("send g_request{%s} %ld to server done!\r\n", g_request, retval);
49
50 retval = recv(sockfd, &g_response, sizeof(g_response), 0);
51 if (retval <= 0) {
52 printf("send g_response from server failed or done, %ld!\r\n", retval);
53 lwip_close(sockfd);
54 }
55 g_response[retval] = '\0';
56 printf("recv g_response{%s} %ld from server done!\r\n", g_response, retval);
57 lwip_close(sockfd);
58 }
59
NetDemoTest(unsigned short port, const char* host)60 void NetDemoTest(unsigned short port, const char* host)
61 {
62 (void) host;
63 printf("TcpClientTest start\r\n");
64 printf("I will connect to %s\r\n", host);
65 TcpClientTest(host, port);
66 printf("TcpClientTest done!\r\n");
67 }
68
69