用c语言写一个基于Linux的103协议代码
时间: 2023-03-19 20:25:02 浏览: 76
对于这个问题,我可以告诉你,要使用C语言编写一个基于Linux的103协议代码,你需要使用Linux的网络API来实现,比如socket,bind,listen,accept,send,recv等等,具体的实现方法可以参考网上关于Linux网络编程的相关资料。
相关问题
c语言linux tcp协议代码
### 回答1:
很高兴为您提供帮助!以下是一个简单的 C 语言程序示例,用于创建基于 TCP 协议的 Linux 套接字并进行通信:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(const char *msg) {
perror(msg);
exit(1);
}
int main(int argc, char *argv[]) {
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
close(sockfd);
return 0;
}
```
这个程序实现了基本的客户端-服务器模型。在程序运行时,用户需要提供服务器的主机名和端口号作为参数。程序将创建一个套接字并连接到指定的服务器。然后,程序将从标准输入读取一行文本并将其发送到服务器。服务器将对收到的消息进行处理并将响应发送回客户端。最后,客户端将响应打印到标准输出并关闭连接。
这个程序只是一个简单的示例,实际使用时可能需要进行修改和扩展以满足具体需求。
### 回答2:
C语言是一种高级编程语言,广泛应用于系统开发和网络编程。Linux是一个开放源代码的操作系统,具有稳定性和灵活性的特点,被广泛用于服务器和嵌入式设备。
在使用C语言编写Linux下的TCP协议代码时,我们可以使用Linux提供的socket库进行网络通信。下面是一个简单的例子,展示了如何在Linux下使用C语言编写TCP服务器和客户端代码:
服务器端代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
int server_fd, new_socket;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[BUFFER_SIZE] = {0};
char *hello = "Hello from server";
// 创建TCP套接字
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置套接字选项,允许地址重用
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
perror("setsockopt failed");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(PORT);
// 绑定套接字到指定地址和端口
if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
// 监听连接
if (listen(server_fd, 3) < 0) {
perror("listen failed");
exit(EXIT_FAILURE);
}
// 接受连接并处理请求
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen)) < 0) {
perror("accept failed");
exit(EXIT_FAILURE);
}
// 读取客户端发送的数据
read(new_socket, buffer, BUFFER_SIZE);
printf("Client: %s\n", buffer);
// 向客户端发送响应
send(new_socket, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 关闭套接字
close(new_socket);
close(server_fd);
return 0;
}
```
客户端代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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 sock = 0, valread;
struct sockaddr_in serv_addr;
char *hello = "Hello from client";
char buffer[BUFFER_SIZE] = {0};
// 创建TCP套接字
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("\n Socket creation error \n");
return -1;
}
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
// 将IPv4地址从点分十进制转换为二进制
if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
printf("\nInvalid address/ Address not supported \n");
return -1;
}
// 连接服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
printf("\nConnection Failed \n");
return -1;
}
// 向服务器发送数据
send(sock, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 读取服务器响应
valread = read(sock, buffer, BUFFER_SIZE);
printf("Server: %s\n", buffer);
// 关闭套接字
close(sock);
return 0;
}
```
这是一个简单的例子,演示了如何使用C语言和Linux下的socket API编写TCP服务器和客户端代码。实际使用中,还可以对代码进行进一步的优化和扩展,以满足具体需求。
### 回答3:
C语言在Linux系统中使用TCP协议的代码可以如下:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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, new_sockfd; // 声明套接字描述符
struct sockaddr_in server_addr, client_addr;
socklen_t cli_len;
char buffer[BUFFER_SIZE];
// 创建套接字
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("Socket creation failed");
exit(1);
}
// 设置服务器地址
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr.s_addr = INADDR_ANY;
// 绑定套接字
if (bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
perror("Socket binding failed");
exit(1);
}
// 监听套接字
if (listen(sockfd, 10) == -1) {
perror("Listen failed");
exit(1);
}
printf("Server listening on port %d\n", PORT);
// 接收客户端连接
cli_len = sizeof(client_addr);
new_sockfd = accept(sockfd, (struct sockaddr*)&client_addr, &cli_len);
if (new_sockfd == -1) {
perror("Accept failed");
exit(1);
}
printf("Client connected\n");
// 接收和发送数据
while (1) {
memset(buffer, 0, sizeof(buffer));
if (recv(new_sockfd, buffer, BUFFER_SIZE-1, 0) == -1) {
perror("Receive failed");
exit(1);
}
printf("Received message: %s\n", buffer);
strcpy(buffer, "Server response");
if (send(new_sockfd, buffer, strlen(buffer), 0) == -1) {
perror("Send failed");
exit(1);
}
printf("Response sent\n");
}
// 关闭套接字
close(new_sockfd);
close(sockfd);
return 0;
}
以上是一个简单的TCP服务器代码,它首先创建一个套接字,然后绑定端口和地址。随后,通过监听套接字等待客户端的连接。一旦有客户端连接进来,它将接受客户端的请求,并发送响应。在本例中,服务器接收并打印客户端传来的消息,并发送一个固定的响应。
请注意,这只是一个简单的示例代码。在实际使用中,可能需要更多的错误处理和异常处理逻辑,并进行更严格的数据验证和处理。
Linux中用C语言写一个socket编程示例
### 回答1:
以下是 Linux 中使用 C 语言编写的简单 socket 编程示例:
服务端代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg) {
perror(msg);
exit(1);
}
int main(int argc, char *argv[]) {
int sockfd, newsockfd, portno;
socklen_t clilen;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
int n;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr,
&clilen);
if (newsockfd < 0)
error("ERROR on accept");
bzero(buffer,256);
n = read(newsockfd,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
n = write(newsockfd,"I got your message",18);
if (n < 0) error("ERROR writing to socket");
close(newsockfd);
close(sockfd);
return 0;
}
```
客户端代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(const char *msg) {
perror(msg);
exit(0);
}
int main(int argc, char *argv[]) {
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *
### 回答2:
以下是一个用C语言编写的简单的Linux socket编程示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h> // close函数
#include <arpa/inet.h> // htons, inet_pton函数
#include <sys/socket.h> // socket, bind, listen, accept, recv, send函数
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
int server_fd, new_socket, valread;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[BUFFER_SIZE] = {0};
char *hello = "Hello from server";
// 创建套接字
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("Socket creation failed");
exit(EXIT_FAILURE);
}
// 设置套接字选项,允许地址重复使用
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
perror("Setsockopt failed");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(PORT);
// 绑定套接字到指定端口
if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
perror("Bind failed");
exit(EXIT_FAILURE);
}
// 监听连接请求
if (listen(server_fd, 3) < 0) {
perror("Listen failed");
exit(EXIT_FAILURE);
}
// 接受连接请求
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
perror("Accept failed");
exit(EXIT_FAILURE);
}
// 接收客户端数据
valread = recv(new_socket, buffer, BUFFER_SIZE, 0);
printf("Received: %s\n", buffer);
// 向客户端发送消息
send(new_socket, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 关闭套接字
close(new_socket);
close(server_fd);
return 0;
}
```
该示例中创建了一个TCP服务器,会监听在8080端口上。当有客户端连接后,会接收客户端发送的消息,并向客户端发送"Hello from server"消息。最后关闭套接字。
### 回答3:
在Linux系统中,我们可以使用C语言编写一个基本的Socket编程示例。以下是一个简单的Server-Client示例,包括了服务器端和客户端的代码。
服务器端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
int server_fd, new_socket;
struct sockaddr_in address;
int addrlen = sizeof(address);
char buffer[BUFFER_SIZE] = {0};
char *server_response = "Server is connected!\n";
// 创建Socket
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("Socket creation failed");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(PORT);
// 绑定Socket到指定端口
if (bind(server_fd, (struct sockaddr *)&address, sizeof(address))<0) {
perror("Binding failed");
exit(EXIT_FAILURE);
}
// 监听连接
if (listen(server_fd, 3) < 0) {
perror("Listening failed");
exit(EXIT_FAILURE);
}
// 建立连接
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
perror("Acceptance failed");
exit(EXIT_FAILURE);
}
// 发送欢迎消息
send(new_socket, server_response, strlen(server_response), 0);
printf("Welcome message sent\n");
// 接收客户端消息并发送回复
while (1) {
memset(buffer, 0, sizeof(buffer));
read(new_socket, buffer, BUFFER_SIZE);
printf("Client message: %s\n", buffer);
send(new_socket, buffer, BUFFER_SIZE, 0);
}
return 0;
}
```
客户端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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 sock = 0, valread;
struct sockaddr_in serv_addr;
char *client_message = "Hello from client";
char buffer[BUFFER_SIZE] = {0};
// 创建Socket
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Socket creation failed");
exit(EXIT_FAILURE);
}
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
// 将IPv4地址从点分十进制转换为网络字节序
if(inet_pton(AF_INET, "127.0.0.1", &(serv_addr.sin_addr))<=0) {
perror("Invalid address or address not supported");
exit(EXIT_FAILURE);
}
// 连接到服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
perror("Connection failed");
exit(EXIT_FAILURE);
}
// 发送消息
send(sock, client_message, strlen(client_message), 0);
printf("Message sent to server\n");
// 接收回复消息
valread = read(sock, buffer, BUFFER_SIZE);
printf("Server message: %s\n", buffer);
return 0;
}
```
以上代码示例展示了Linux中使用C语言编写Socket通信的基本原理。服务器端使用`socket()`函数创建socket,`bind()`函数将socket绑定到指定的端口,`listen()`函数监听连接请求,并使用`accept()`函数接收来自客户端的连接。客户端使用`socket()`函数创建socket,`connect()`函数连接到服务器,并使用`send()`函数发送消息,`read()`函数接收并打印服务器端回复的消息。
以上示例是一个简单的基于TCP协议的Socket通信示例,可以通过编译并在Linux系统上运行进行测试。