简单socket【C/S，服务器收文件】_c语言socket get server文件内容-优快云博客

本文链接：https://blog.youkuaiyun.com/fall221/article/details/8939518

本文介绍了一个简单的Socket通信案例，包括服务器端与客户端的实现。服务器等待客户端连接，并通过子进程接收文件内容，保存为文本文件；客户端则负责发送指定文件到服务器。

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Server：等待连接，有连接进来的时候，就accept，新fork一个子进程，然后read，再将得到的buf存到getpid().txt，父进程继续accept。

Client：连接，然后传送指定文件到Server。

Server：s.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <fcntl.h>
 // ./s 8888 5
 // exe portn n
 int count;
 int init(char *ipaddr, int n)   // 
 {
    int s;
    struct sockaddr_in s_addr;
    int len;
    
    s = socket(AF_INET, SOCK_STREAM, 0);
    s_addr.sin_family = AF_INET;
    s_addr.sin_port = htons(atoi(ipaddr));
    s_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    len = sizeof(s_addr);
    bind(s, (struct sockaddr *)&s_addr, len);
    listen(s, n);
    printf("Server init succeed!\n");
    return s;
 }
 
 int main(int argc, char *argv[])
 {
    struct sockaddr_in c_addr;
    int cn;
    int l;
    
    count=0;
    int s = init(argv[1], atoi(argv[2]) );
    while(1)
    {
        
        cn = accept(s, (struct sockaddr *)&c_addr,&l);
        if(fork()==0)
        {
            printf("accept!\n");
            char buf[1024];
            int len = read(cn, buf,1024);
            if(len<0) 
            { 
                printf("error!\n"); 
            }else 
            {
                char filename[32];
                snprintf(filename, 32, "%d.txt", getpid());
                int fd=open(filename, O_CREAT|O_RDWR, 0600);
                write(fd, buf, len);
                close(fd);
            }
        }
        close(cn);
    }
 
    return 0;
 
 }

gcc s.c -o s

Client：c.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
  #include <fcntl.h>
 int main(int argc, char *argv[])
 {
    struct sockaddr_in s_addr,c_addr;
    int len;
    int x;
    int s;
    char buf[1024];
    int fd;
    
    s = socket(AF_INET, SOCK_STREAM, 0);
    s_addr.sin_family = AF_INET;
    s_addr.sin_port = htons(atoi(argv[2]));
    inet_pton(AF_INET, argv[1], &s_addr.sin_addr);
    
    if (connect(s, (struct sockaddr*)&s_addr, sizeof(struct sockaddr) ) <0)
    {
        printf("connect fail!\n");
        return 0;
    }
    
    fd=open(argv[3], O_CREAT|O_RDWR, 0666);
    x = read(fd, buf,1024);
    write(s, buf, x);
    close(fd);
    
    printf("send %s to server!\n", argv[3]);
 
    return 0;
 
 }

gcc c.c -o c

运行：

administrator@ubuntu:~/test/net/new$ ./s 8888 10 &
[1] 4661
administrator@ubuntu:~/test/net/new$ Server init succeed!

administrator@ubuntu:~/test/net/new$ ./c 127.0.0.1 8888 c.c
client:	send c.c to server!
accept!
server:	save 833 Bytes to 4666.txt
administrator@ubuntu:~/test/net/new$ ll 4666.txt
-rw------- 1 administrator administrator 833 2013-05-17 14:17 4666.txt
administrator@ubuntu:~/test/net/new$ 
administrator@ubuntu:~/test/net/new$ cat 4666.txt 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
  #include <fcntl.h>
 int main(int argc, char *argv[])
 {
    struct sockaddr_in s_addr,c_addr;
    int len;
    int x;
    int s;
    char buf[1024];
    int fd;
    
    s = socket(AF_INET, SOCK_STREAM, 0);
    s_addr.sin_family = AF_INET;
    s_addr.sin_port = htons(atoi(argv[2]));
    inet_pton(AF_INET, argv[1], &s_addr.sin_addr);
    
    if (connect(s, (struct sockaddr*)&s_addr, sizeof(struct sockaddr) ) <0)
    {
        printf("connect fail!\n");
        return 0;
    }
    
    fd=open(argv[3], O_CREAT|O_RDWR, 0666);
    x = read(fd, buf,1024);
    write(s, buf, x);
    close(fd);
    printf("client:\tsend %s to server!\n", argv[3]);
    
 
    return 0;
 
 }
 
administrator@ubuntu:~/test/net/new$