linux udp和tcp代码
时间: 2023-07-25 09:44:24 浏览: 54
以下是 Linux 上使用 C 语言编写 UDP 和 TCP 服务器和客户端的示例代码:
UDP 服务器端代码:
```
#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>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
int sockfd;
struct sockaddr_in server_addr, client_addr;
socklen_t client_len;
char buffer[BUFFER_SIZE];
int n;
// 创建套接字
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
// 初始化服务器地址
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(PORT);
// 绑定套接字
if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
// 接收数据
while (1) {
client_len = sizeof(client_addr);
n = recvfrom(sockfd, buffer, BUFFER_SIZE, 0, (struct sockaddr *)&client_addr, &client_len);
if (n < 0) {
perror("recvfrom");
exit(EXIT_FAILURE);
}
printf("Received packet from %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
printf("Data: %s\n", buffer);
}
// 关闭套接字
close(sockfd);
return 0;
}
```
UDP 客户端代码:
```
#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>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
int sockfd;
struct sockaddr_in server_addr;
char buffer[BUFFER_SIZE];
int n;
// 创建套接字
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
// 初始化服务器地址
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
server_addr.sin_port = htons(PORT);
// 发送数据
while (1) {
printf("Enter message: ");
fgets(buffer, BUFFER_SIZE, stdin);
n = sendto(sockfd, buffer, strlen(buffer), 0, (struct sockaddr *)&server_addr, sizeof(server_addr));
if (n < 0) {
perror("sendto");
exit(EXIT_FAILURE);
}
}
// 关闭套接字
close(sockfd);
return 0;
}
```
TCP 服务器端代码:
```
#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 PORT 8080
#define BUFFER_SIZE 1024
int main() {
int sockfd, newsockfd;
struct sockaddr_in server_addr, client_addr;
socklen_t client_len;
char buffer[BUFFER_SIZE];
int n;
// 创建套接字
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
// 初始化服务器地址
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(PORT);
// 绑定套接字
if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
// 监听套接字
if (listen(sockfd, 5) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
// 接受连接
while (1) {
client_len = sizeof(client_addr);
newsockfd = accept(sockfd, (struct sockaddr *)&client_addr, &client_len);
if (newsockfd < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
printf("Accepted connection from %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
// 接收数据
while ((n = read(newsockfd, buffer, BUFFER_SIZE)) > 0) {
printf("Data: %s\n", buffer);
write(newsockfd, buffer, n);
}
// 关闭连接
close(newsockfd);
}
// 关闭套接字
close(sockfd);
return 0;
}
```
TCP 客户端代码:
```
#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 PORT 8080
#define BUFFER_SIZE 1024
int main() {
int sockfd;
struct sockaddr_in server_addr;
char buffer[BUFFER_SIZE];
int n;
// 创建套接字
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
// 初始化服务器地址
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
server_addr.sin_port = htons(PORT);
// 连接服务器
if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
perror("connect");
exit(EXIT_FAILURE);
}
// 发送数据
while (1) {
printf("Enter message: ");
fgets(buffer, BUFFER_SIZE, stdin);
n = write(sockfd, buffer, strlen(buffer));
if (n < 0) {
perror("write");
exit(EXIT_FAILURE);
}
n = read(sockfd, buffer, BUFFER_SIZE);
if (n < 0) {
perror("read");
exit(EXIT_FAILURE);
}
printf("Received data: %s\n", buffer);
}
// 关闭套接字
close(sockfd);
return 0;
}
```