server.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>

//https://stackoverflow.com/questions/5194666/disable-randomization-of-memory-addresses/30385370#30385370
#include <sys/personality.h>
#include <signal.h>

int processConnection(int fd, int argc, char* argv[]) {
    close(0);
    close(1);
    close(2);
    dup2(fd, 0);
    dup2(fd, 1);
    dup2(fd, 2);

    if(getenv("RUN_ALSR")) {
      printf("Running with ALSR turned off\n");
      int out = personality(ADDR_NO_RANDOMIZE);
      fflush(stdout);
    }
    
    execvp(argv[1], &argv[1]);
}

int main(int argc, char* argv[]) {
    if (argc < 2) {
        printf("Please provide the application to run on connection");
        exit(-1);
    }

    struct sockaddr_in address;
    address.sin_family = AF_INET;
    address.sin_port = htons(1337);
    address.sin_addr.s_addr = INADDR_ANY;

    int sock = socket(AF_INET, SOCK_STREAM, 0);
    int status = bind(sock, (struct sockaddr *) &address, sizeof(address));

    if (status == -1) {
        printf("Failed to bind socket, error is: %s\n", strerror(errno));
        exit(-2);
    }

    listen(sock, 0);


    printf("Server started, listening on 0.0.0.0:1337, connect using the client app!\n");

    while (1) {
        int resultfd = accept(sock, NULL, NULL);
        int pid = fork();
        if (pid == 0)
            return processConnection(resultfd, argc, argv);
        else {
	  signal(SIGCHLD, SIG_IGN); //Dont give fuck about Zombie Children.
            printf("Received connection as FD %d\n", resultfd);
            close(resultfd);
        }
    }

    return 0;
}