你好,我正在尝试使我想要这些东西的TCP客户端/服务器。 客户端将给出文件名或文件的文件名路径。 服务器将找到该文件并提供以下详细信息: 权限,大小,所有者,所有者组,修改/创建日期,单词数量,用户标识和优先级,如果发生错误,则将这些文件发送到-1的客户端。客户端将打印这些细节。我已经做了很多这些事情,但我有一个巨大的问题,所以我不能继续,我的问题是,服务器无法识别文件的路径,但我试图命名文件和通信它OK.What我我做错了吗? 预先感谢您你如何传递从客户端到服务器的路径?
CLIENT
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[1024];
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,&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the filename or path of filename: ");
bzero(buffer,1024);
fgets(buffer,1024,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,1024);
n = read(sockfd,buffer,1024);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
return 0;
SERVER
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/resource.h>
#include <sys/time.h>
void error(char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
FILE *fp;
int sockfd, newsockfd, portno, clilen,i;
char buffer[1024],filename[1024];
char * pPath;
struct sockaddr_in serv_addr, cli_addr;
int n;
int which = PRIO_PROCESS;
id_t pid;
int ret;
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,1024);
n = read(newsockfd,buffer,1024);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
system("ls -al 1.txt > ls.txt");
system("wc -w 1.txt > wc.txt");
/* pPath = getenv ("PATH");
if (pPath!=NULL)
printf ("The current path is: %s\n",pPath);
system("touch path.txt");
fp=fopen("path.txt","w");
if (fp==NULL) exit(1);
fprintf(fp,pPath);
fclose(fp); */
pid = getpid();
ret = getpriority(which, pid);
printf("priority %d user id %d ret %d",which,pid,ret);
system("paste ls.txt wc.txt user.txt > info.txt");
fp=fopen("info.txt","r");
if (fp==NULL) exit(1);
for(int i=0;i<1000;i++){
fscanf(fp,"%c",&buffer[i]);
}
fclose(fp);
n = write(newsockfd,buffer,1024);
if (n < 0) error("ERROR writing to socket");
return 0;
}
}`
谢谢你的快速reply.To具体,教授也没问我们做出这个txt文件我创建的,但我创建因为我无法找到一个解决方案我写不出一切buffer.It应该是这样的:
缓冲层i与路径来从客户 查找路径文件从缓存(这是我有问题) LS -al写缓冲(我写到.txt) wc写入缓冲区(我写到.txt) 路写入缓存(还没有这样做还) 用户信息写入到缓存(还没有这样做还) 缓冲发送到客户端 打印所有这些信息缓冲
我尝试sprintf的,但我没不明白你是怎么使用它的,但是这个命令看起来比我的好谢谢:)。如果我理解的很好,否则通过缓冲区。
是的,例如,如果文件名包含“; rm -rf *;”,系统调用会发生什么情况。 – buddhabrot 2010-11-22 09:19:05