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[英]using eclipse to connect to remote machine[linux server] using ssh
[英]Server does not connect to remote machine (Linux)
我一直无法使用我在C语言中编写的这个简单服务器将两个服务器连接在一起:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "hacking.h"
#define PORT 7890 // the port users will be connecting to
int main(void) {
int sockfd, new_sockfd; // listen on sock_fd, new connection on new_fd
struct sockaddr_in host_addr, client_addr; // my address information
socklen_t sin_size;
int recv_length=1, yes=1;
char buffer[1024];
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1)
fatal("in socket");
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1)
fatal("setting socket option SO_REUSEADDR");
host_addr.sin_family = AF_INET; // host byte order
host_addr.sin_port = htons(PORT); // short, network byte order
host_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
memset(&(host_addr.sin_zero), '\0', 8); // zero the rest of the struct
if (bind(sockfd, (struct sockaddr *)&host_addr, sizeof(struct sockaddr)) == -1)
fatal("binding to socket");
if (listen(sockfd, 5) == -1)
fatal("listening on socket");
while(1) { // Accept loop
sin_size = sizeof(struct sockaddr_in);
new_sockfd = accept(sockfd, (struct sockaddr *)&client_addr, &sin_size);
if(new_sockfd == -1)
fatal("accepting connection");
printf("server: got connection from %s port %d\n",inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
send(new_sockfd, "Hello World!\n", 13, 0);
recv_length = recv(new_sockfd, &buffer, 1024, 0);
while(recv_length > 0) {
printf("RECV: %d bytes\n", recv_length);
dump(buffer, recv_length);
recv_length = recv(new_sockfd, &buffer, 1024, 0);
}
close(new_sockfd);
}
return 0;
}
当我通过执行以下命令在服务器A上运行此代码时:
gcc simple_server.c
./a.out
和
telnet 172.31.**.*** 7890
在服务器B上,我得到的只是
Trying 172.31.**.***...
我在这里可能做错了什么? 谢谢。
这是由于服务器上的防火墙A它正在尝试连接服务器,但是由于防火墙规则,数据包不断丢失
运行以下命令以获取防火墙规则列表
iptables -L
然后运行以下命令为端口7890添加规则
iptables -I输入-p tcp --dport 7890 -j接受
如果这不起作用,请检查中间的路由器是否丢包
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