作者ful6up (今天不回家)
看板LinuxDev
標題[問題] client和server問題
時間Sat May 28 19:39:47 2011
不太清楚裡面是怎樣運作的
以下是程式碼
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include<sys/socket>
//#include <winsock2.h>
#include <resolv.h>
//#include<windows.h>
#define PORT_TIME 13 /* "time" (not available on RedHat) */
#define PORT_FTP 21 /* FTP connection port */
#define SERVER_ADDR "127.0.0.1" /* localhost */
#define MAXBUF 1024
int main()
{ int sockfd;
struct sockaddr_in dest;
char buffer[MAXBUF];
/*---Open socket for streaming---*/
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
perror("Socket");
exit(errno);
}
/*---Initialize server address/port struct---*/
bzero(&dest, sizeof(dest));//copy zero to the string
dest.sin_family = AF_INET;//AF-INET ===>internet protocols
dest.sin_port = htons(PORT_FTP);//set port
if ( inet_aton(SERVER_ADDR, &dest.sin_addr.s_addr) == 0 )//inet_aton()
convert ip address to integer
{
perror(SERVER_ADDR);
exit(errno);
}
/*---Connect to server---*/
if ( connect(sockfd, (struct sockaddr*)&dest, sizeof(dest)) != 0
)//connect socket
{
perror("Connect ");
exit(errno);
}
/*---Get "Hello?"---*/
bzero(buffer, MAXBUF);
recv(sockfd, buffer, sizeof(buffer), 0);
printf("%s", buffer);
/*---Clean up---*/
close(sockfd);
return 0;
}
執行結果:
connection refused
不是去連結本機嗎?
並起連結port:21的地方
為何還會有無法連結的情況??
請版上神人指導一下
感激
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◆ From: 140.116.16.190
1F：→ james732:你的電腦有執行FTP server程式嗎？ 05/28 19:58
2F：→ ful6up:有~但是還是連不進去... 05/29 21:52
3F：→ MiLu307:check the firewall setting? 05/30 18:05
4F：推 antontw:telnet 127.0.0.1 21 先？ 06/01 14:23
5F：→ ful6up:感謝~可以使用了!! 06/03 15:24