socket编程学习之TCP模式

ゝ一纸荒年。 2021-10-15 07:19 377阅读 0赞

1、目的：根据[TCP编程模式][TCP]，编写一个可以进行通信的进程。

2、编写文件主要包括：

*  公共头文件：utili.h
 *  客户端进程：cli.c
 *  服务器进程：ser.c
 *  Makefile文件：Makefile

3、各个文件详细代码如下：

公共头文件：utili.h

#include<string.h>
    #include<stdlib.h>
    
    #include<sys/socket.h>
    #include<netinet/in.h>
    #include<arpa/inet.h>
    
    #define BUFFER_MAX_SIZE 256
    char sendbuf[BUFFER_MAX_SIZE];
    char recvbuf[BUFFER_MAX_SIZE];
    
    #define LISTEN_PORT 8080
    #define LISTEN_IP "127.0.0.1"
    
    #define LISTEN_BACKLOG 5
    
    int Socket(int domain, int type, int protocol)
    {
        int fd = socket(domain, type, protocol);
        if(fd == -1)
        {
            perror("socket.");
            exit(1);
        }
        return fd;
    }
    
    int Bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
    {
        int ret = bind(sockfd, addr, addrlen);
        if(ret == -1)
        {
            perror("bind.");
            exit(1);
        }
        return ret;
    }
    
    int Listen(int sockfd, int backlog)
    {
        int ret = listen(sockfd, backlog);
        if(ret == -1)
        {
            perror("listen.");
            exit(1);
        }
        return ret;
    }
    
    int startup(const char *ip, int port)
    {
        int fd = Socket(AF_INET, SOCK_STREAM, 0);
        struct sockaddr_in address;
        address.sin_family = AF_INET;
        address.sin_port = htons(port);
        address.sin_addr.s_addr = inet_addr(ip);
    
        socklen_t addrlen = sizeof(struct sockaddr);
        Bind(fd, (struct sockaddr*)&address, addrlen);
    
        Listen(fd, LISTEN_BACKLOG);
    
        return fd;
    }

服务器进程代码：ser.c

#include "utili.h"
    
    int main(int argc, char *argv[])
    {
        if(argc != 3)
        {
            printf("Usage: <Sername ip port>.\n");
            return -1;
        }
        int sockSer = startup(argv[1], atoi(argv[2]));
    
        struct sockaddr_in addrCli;
        socklen_t addrlen = sizeof(struct sockaddr);
        int sockConn = accept(sockSer, (struct sockaddr*)&addrCli, &addrlen);
        if(sockConn == -1)
        {
            printf("Server accept Client connect fail.\n");
            close(sockSer);
            exit(1);
        }
        else
        {
            printf("Server accept Client connect success.\n");
            printf("Client ip:>%s\n", inet_ntoa(addrCli.sin_addr));
            printf("Client port:>%d\n", addrCli.sin_port);
        }
    
        while(1)
        {
            printf("Ser:>");
            scanf("%s", sendbuf);
            send(sockConn, sendbuf, strlen(sendbuf)+1, 0);
            recv(sockConn, recvbuf, BUFFER_MAX_SIZE, 0);
            printf("Cli:>%s\n", recvbuf);
        }
    
        close(sockSer);
        return 0;
    }

客户端进程代码：cli.c

#include "../utili.h"
    
    int main(int argc, char *argv[])
    {
        if(argc != 3)
        {
            printf("Usage: <Cliname ip port>.\n");
            return -1;
        }
        int sockCli = socket(AF_INET, SOCK_STREAM, 0);
        if(sockCli == -1)
        {
            perror("socket.");
            exit(1);
        }
    
        struct sockaddr_in addrSer;
        addrSer.sin_family = AF_INET;
        addrSer.sin_port = htons(atoi(argv[2]));
        addrSer.sin_addr.s_addr = inet_addr(argv[1]);
        
        socklen_t addrlen = sizeof(struct sockaddr);
        int ret = connect(sockCli, (struct sockaddr*)&addrSer, addrlen);
        if(ret == -1)
        {
            perror("connect.");
            close(sockCli);
            exit(1);
        }
    
        while(1)
        {
            recv(sockCli, recvbuf, BUFFER_MAX_SIZE, 0);
            printf("Ser:>%s\n", recvbuf);
            printf("Cli:>");
            scanf("%s",sendbuf);
            send(sockCli, sendbuf, strlen(sendbuf)+1, 0);
        }
    
        close(sockCli);
    
        return 0;
    }

Makefile文件代码：Makefile

all: ser cli
    
    ser:ser.c
    	gcc -o ser ser.c
    cli:cli.c
    	gcc -o cli cli.c
    
    .PHONY:clean
    clean:
    	rm ser cli

4、make：生成文件ser和cli

![20190813151648597.png][]

5、分别执行ser和cli进行通信(借助putty)：

服务器：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70][]

客户端：

![20190813152205980.png][]

[TCP]: https://blog.csdn.net/qq_26079093/article/details/99318145
[20190813151648597.png]: /images/20211015/9b1470d6c76c48638e8218826d3a502b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2MDc5MDkz_size_16_color_FFFFFF_t_70]: /images/20211015/53bfae7c85944049ad407a3c5f9bbb45.png
[20190813152205980.png]: /images/20211015/6362397cd1e0486c9b3d429da4681ec4.png