(1)编写一对用于发送和接收信息的IP多播程序,其中: 发送端可向该多播组广播文件中保存的文本信息,接收端可接收传递到该多播组的文本信息。用C语言
时间: 2024-05-06 10:16:22 浏览: 17
发送端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#define MCAST_PORT 8888
#define MCAST_ADDR "224.0.0.88"
#define BUFFER_SIZE 1024
int main(int argc, char *argv[]) {
struct sockaddr_in mcast_addr;
int sockfd, n;
char buffer[BUFFER_SIZE];
FILE *fp;
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
exit(1);
}
memset(&mcast_addr, 0, sizeof(mcast_addr));
mcast_addr.sin_family = AF_INET;
mcast_addr.sin_addr.s_addr = inet_addr(MCAST_ADDR);
mcast_addr.sin_port = htons(MCAST_PORT);
if ((fp = fopen(argv[1], "r")) == NULL) {
perror("fopen");
exit(1);
}
while (fgets(buffer, BUFFER_SIZE, fp) != NULL) {
if (sendto(sockfd, buffer, strlen(buffer), 0, (struct sockaddr *)&mcast_addr, sizeof(mcast_addr)) < 0) {
perror("sendto");
exit(1);
}
}
fclose(fp);
close(sockfd);
return 0;
}
```
接收端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#define MCAST_PORT 8888
#define MCAST_ADDR "224.0.0.88"
#define BUFFER_SIZE 1024
int main() {
struct sockaddr_in local_addr, mcast_addr;
int sockfd, n;
char buffer[BUFFER_SIZE];
socklen_t len;
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
exit(1);
}
memset(&local_addr, 0, sizeof(local_addr));
local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
local_addr.sin_port = htons(MCAST_PORT);
if (bind(sockfd, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0) {
perror("bind");
exit(1);
}
memset(&mcast_addr, 0, sizeof(mcast_addr));
mcast_addr.sin_family = AF_INET;
mcast_addr.sin_addr.s_addr = inet_addr(MCAST_ADDR);
mcast_addr.sin_port = htons(MCAST_PORT);
if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mcast_addr, sizeof(mcast_addr)) < 0) {
perror("setsockopt");
exit(1);
}
while (1) {
len = sizeof(mcast_addr);
if ((n = recvfrom(sockfd, buffer, BUFFER_SIZE, 0, (struct sockaddr *)&mcast_addr, &len)) < 0) {
perror("recvfrom");
exit(1);
}
buffer[n] = '\0';
printf("%s", buffer);
}
close(sockfd);
return 0;
}
```
以上代码中,发送端从指定的文件中读取文本信息并向指定的多播组广播,而接收端则从指定的多播组接收文本信息并输出到终端。需要注意的是,发送端需要传入要广播的文件名作为命令行参数。
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![application/x-rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)