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C语言socket编程——linux环境

2024-07-06 08:32:44   229人阅读

先写一个服务器端的监听程序，功能室从客户端读取字符，接收到后告知客户端“I got your message: ”+收到的消息：server.c
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#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <unistd.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
   
#define MAXLINE 1000 
#define SERV_PORT 9931 
   
void doprocessing(int sock, struct sockaddr_in cliaddr) 
{ 
    int n; 
   
    char str[INET_ADDRSTRLEN]; 
    char *buf = (char *)malloc(MAXLINE); 
    char *reply = (char *)malloc(MAXLINE*2);
    memset(buf, ‘\0‘, MAXLINE); 
    while (1) { 
        n = read(sock, buf, MAXLINE); 
        strcpy(reply,"I got your message: ");
        if (n < 0) { 
            perror("Error reading from socket!"); 
            return; 
        } else { 
            printf("Connect from %s:%d\n", inet_ntop(AF_INET, &cliaddr.sin_addr, str, sizeof(str)), ntohs(cliaddr.sin_port));
        strcat(reply,buf);
            printf("receive %s\n",buf);
            write(sock, reply, MAXLINE);
        }
    memset(buf,0,sizeof(char)*MAXLINE);
    memset(reply,0,sizeof(char)*MAXLINE);
    }
    free(reply);
    free(buf); 
} 
   
   
int main(void) 
{ 
    struct sockaddr_in servaddr, cliaddr; 
 
    int listenfd, connfd, pid; 
    socklen_t cliaddr_len = sizeof(cliaddr); 
   
    listenfd = socket(AF_INET, SOCK_STREAM, 0); 
    if (listenfd < 0) { 
        perror("Error opening socket!"); 
        exit(-1); 
    } 
 
 
    memset(&servaddr, 0, sizeof(struct sockaddr_in)); 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = inet_addr("10.13.81.182"); 
    servaddr.sin_port = htons(SERV_PORT);    
 
    bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); 
   
 
    listen(listenfd, 2000); 
   
    printf("server服务器开始等待客户端连接 ...\n"); 
   
    while (1) {  
        connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &cliaddr_len); 
   
        pid = fork(); 
   
        if (pid == -1) { 
            perror("call to fork"); 
            exit(-1); 
        } else if (pid == 0) { 
            close(listenfd); 
            doprocessing(connfd, cliaddr); 
            exit(0); 
        } else { 
            close(connfd); 
        } 
    } 
   
    return 0; 
}

 

再写一个客户端通过socket通信向服务器发送数据的代码：cli.c

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#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <unistd.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
 
#define MAXLINE 1000
#define SERV_PORT 9931 
 
int main(int argc, char *argv[]) 
{ 
 
    struct sockaddr_in servaddr; 
    char *buf = (char *)malloc(MAXLINE);
    char *rec = (char *)malloc(MAXLINE);
    int servfd, n; 
 
    servfd = socket(AF_INET, SOCK_STREAM, 0); 
 
    memset(&servaddr, 0, sizeof(servaddr)); 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = inet_addr("10.13.81.182"); 
    servaddr.sin_port = htons(SERV_PORT); 
 
    connect(servfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); 
    while (fgets(buf, MAXLINE, stdin)!= NULL) { 
        write(servfd, buf, strlen(buf)); 
 
        n = read(servfd, rec, MAXLINE); 
        if (n == 0) {
            perror("The other side has been closed."); 
            exit(-1); 
        } else {
            printf("从服务器返回的信息为:%s\n", rec); 
        }
        memset(rec,0,sizeof(char)*MAXLINE);
        memset(buf,0,sizeof(char)*MAXLINE);
    } 
    close(servfd); 
    return 0; 
}

 

 

关于TCP连接的稍后补上

 


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