c语言实现websocket客户端
时间: 2023-10-10 17:04:27 浏览: 38
很抱歉,作为 AI 语言模型,我无法提供具体的编程实现。但是,下面是一个基本的 WebSocket 客户端示例,供您参考:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#define MAXLINE 1024
#define PORT 80
int main(int argc, char *argv[]) {
int sockfd, n;
char recvline[MAXLINE + 1];
struct sockaddr_in servaddr;
struct hostent *he;
char *hostname = "echo.websocket.org"; // WebSocket 服务端主机名
char *path = "/"; // WebSocket 路径
char *sec_key = "dGhlIHNhbXBsZSBub25jZQ=="; // Sec-WebSocket-Key
char *req = malloc(MAXLINE); // HTTP 请求
char *res = malloc(MAXLINE); // HTTP 响应
// 创建套接字
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket error");
exit(1);
}
// 获取服务端 IP 地址
if ((he = gethostbyname(hostname)) == NULL) {
perror("gethostbyname error");
exit(1);
}
// 设置服务端地址
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(PORT);
servaddr.sin_addr = *((struct in_addr *)he->h_addr);
// 连接服务端
if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
perror("connect error");
exit(1);
}
// 构造 HTTP 请求
sprintf(req, "GET %s HTTP/1.1\r\n", path);
sprintf(req + strlen(req), "Host: %s\r\n", hostname);
sprintf(req + strlen(req), "Upgrade: websocket\r\n");
sprintf(req + strlen(req), "Connection: Upgrade\r\n");
sprintf(req + strlen(req), "Sec-WebSocket-Key: %s\r\n", sec_key);
sprintf(req + strlen(req), "Sec-WebSocket-Version: 13\r\n");
sprintf(req + strlen(req), "\r\n");
// 发送 HTTP 请求
write(sockfd, req, strlen(req));
// 接收 HTTP 响应
n = read(sockfd, res, MAXLINE);
res[n] = '\0';
printf("Response:\n%s\n", res);
// 进入 WebSocket 数据传输阶段
while (1) {
// 接收 WebSocket 帧
n = read(sockfd, recvline, MAXLINE);
recvline[n] = '\0';
// 解析 WebSocket 帧
int opcode = recvline[0] & 0x0F;
int payload_len = recvline[1] & 0x7F;
char *payload_data = recvline + 2;
// 输出 WebSocket 数据
printf("WebSocket Data:\n%s\n", payload_data);
// 发送 WebSocket 帧
char *sendline = "Hello, WebSocket!";
int sendlen = strlen(sendline);
char *sendframe = malloc(sendlen + 2);
sendframe[0] = 0x81;
sendframe[1] = sendlen;
memcpy(sendframe + 2, sendline, sendlen);
write(sockfd, sendframe, sendlen + 2);
free(sendframe);
}
// 关闭套接字
close(sockfd);
return 0;
}
```
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