Error Page.

/* (C) 1999 - secureroot.com production this simple c script makes it possible to act as a gateway to firewall protected network... let say you want to install this script at http://www.mysite.com/cgi/tunnel.cgi and you want it to redirect all connections to a server behind firewall with ip 192.168.1.34... you have to set MY_SERV to 192.168.1.34 and PATH to path on the protected server (example: /documents/). Everytime someone access http://www.mysite.com/cgi/tunnel.cgi?index.html he or she will see the content of http://192.168.1.34/documents/index.html Tested on: Linux Slackware 3.6 Linux Red Hat 6.0 SunOS 5.7 */ #include #include #include #include #include #include #include #include #include #include #define MY_SERV "192.168.1.34" /* redirect to this host (behind firewall) */ #define PATH "/documents/" /* redirect to this location */ #define MAXHTMLSIZE 128*1024 /* max 128kb html */ #define TIMEOUT 60 /* seconds */ char *type,*buf; /* extern int socket(int domain, int type,int protocol); extern unsigned long int inet_addr(const char *cp); extern int connect(int sockfd, struct sockaddr *serv_addr, int addrlen); */ extern void timeon(); void timeon () { printf("\n"); printf("Error Page.\n"); printf("\n"); printf("Can't connect to the server"); printf("

Programming by secureroot.com\n"); exit; } int open_http (char *hostaddr, unsigned int port){ int sockfd; struct sockaddr_in serv_addr; bzero((char *) &serv_addr, sizeof(serv_addr)); serv_addr.sin_family=AF_INET; serv_addr.sin_addr.s_addr=inet_addr(hostaddr); serv_addr.sin_port=htons(port); signal(SIGALRM, *timeon); alarm(TIMEOUT); if((sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0) { signal(SIGALRM,SIG_IGN); return(-1); } if((connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr))) < 0) { signal(SIGALRM,SIG_IGN); return(-2); } /* signal(SIGALRM,SIG_IGN);*/ return(sockfd); } int download (char *hostaddr, unsigned int port, char *in){ int fd; char *s, *content, *temp, *remoteaddr, *ref=""; int size,i; char str[BUFSIZ]=""; printf("Content-type: text/html\r\n\r\n"); if((fd = open_http(hostaddr,port))<0) return(-1); /* if (getenv("HTTP_REFERER")!=0) ref=getenv("HTTP_REFERER");*/ remoteaddr=getenv("REMOTE_ADDR"); sprintf(str,"GET %s%s&ip=%s\r\n",PATH,in,remoteaddr); /* Referer: %s-%s\r\n ,ref,remoteaddr*/ strcat(str,"\r\n\r\n"); if(write(fd,str,strlen(str))<0) return(-1); /* read the answer from the server */ s=buf; size=0;i=0; while(i=read(fd,s,MAXHTMLSIZE-1-size)){ size+=i; s+=i; if(i<0) return(-1); } close(fd); buf[size]=0; printf("%s\n",buf); } main() { char *env; buf=(char*)malloc(MAXHTMLSIZE); env=getenv("QUERY_STRING"); if (download(MY_SERV,8080,env)<0) timeon; }