实验四：Linux 网络通信编程

1.仿照 togglesi.c 和 togglec.c,编写一个网络通信程序,服务器端为 task43s.c,客户端 为 task43c.c，客户端将从服务器下载指定文件，并显示输出

task43c.c

#include "wrapper.h"
char* getname(char *str);
int main(int argc, char **argv) 
{
    int client_sock, port;
    char *host, buf[MAXLINE],*file_name, *name;
    rio_t rio;
    if (argc != 4) {
	    fprintf(stderr, "usage: %s \n", argv[0]);
	    exit(1);
    }
    host = argv[1];
    port = atoi(argv[2]);
    file_name = argv[3];
    client_sock = open_client_sock(host, port);
    send(client_sock, file_name, strlen(file_name),0);
    FILE* file;
    name=getname(argv[3]);
    while(recv(client_sock, buf, MAXLINE,0)!=0){
		if((file=fopen(name,"wb"))==NULL)
		{
			break;
		}
	
   	fputs(buf, file); 
	fputs(buf, stdout);
    }

    if(file!=NULL){
	 fclose(file);
	printf("file %s download succeed\n",name);
    }
    else{
	printf("file %s download fail\n",name);
    }
    close(client_sock);
    exit(0);
}
char* getname(char *str){
	char *p,*tmp;
       	p = strtok(str, "/");
	tmp = p;
       	while(tmp)
       	{
	       	p = tmp;
		tmp = strtok(NULL, "/");
       	}
	return p;

}

task43s.c

#include "wrapper.h"

void toggle(int conn_sock);

int main(int argc, char **argv) 
{
    int listen_sock, conn_sock, port, clientlen;
    struct sockaddr_in clientaddr;
    struct hostent *hp;
    char *haddrp;
	
    if (argc != 2) {
	    fprintf(stderr, "usage: %s \n", argv[0]);
	    exit(1);
    }
    port = atoi(argv[1]);

    listen_sock = open_listen_sock(port);    
    while (1) {
	    clientlen = sizeof(clientaddr);
	    conn_sock = accept(listen_sock, (SA *)&clientaddr, &clientlen);

	    /* determine the domain name and IP address of the client */
	    hp = Gethostbyaddr((const char *)&clientaddr.sin_addr.s_addr, 
			   sizeof(clientaddr.sin_addr.s_addr), AF_INET);
	    haddrp = inet_ntoa(clientaddr.sin_addr);
	    printf("server connected to %s (%s)\n", hp->h_name, haddrp);
	    toggle(conn_sock);
	    close(conn_sock);
    }
    exit(0);
}

void toggle(int conn_sock)
{
	int n;
	char buf[MAXLINE];
	if((n=recv(conn_sock,buf,MAXLINE,0))>0){
		printf("downlowd the file %s ",buf);
		FILE * file;
		memset(buf,sizeof(buf),0);
		if((file=fopen(buf,"rb"))!=NULL){
			while (!feof(file))  {
				fgets(buf, sizeof(buf), file);
				send(conn_sock,buf,sizeof(buf),0);
			}
			printf("succeed\n");
			fclose(file);
		}
		else{
			printf("fail\n");
			send(conn_sock,"",0,0);
		}

	}
	memset(buf,0,sizeof(buf));
}

gcc task43s.c -o task43s -L. -lwrapper
./task43s 12345

gcc task43c.c -o task43c -L. -lwrapper
./task43c localhost 12345 文件路径